[&#8230;] Viagra contains&nbsp;Sildenafil, which was initially tested in cardiac trials. It was termed as a “lucky accident” when the nurses in the wards started noticing that these patients’ who received Viagra preferred lying on their tummy with embarrassment to hide their penile erections. It was then more studies were done to establish its role in&nbsp;erectile dysfunction&nbsp;(ED). [&#8230;]